<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <script>
        function createDog(name, age) {
            var obj = new Object();
            obj.name = name;
            obj.age = age;
            obj.sayName = function() {
                alert("汪汪");
            }
            return obj;

        }
        var obj1 = createDog("乐乐", 20);
        console.log(obj1.name);
        obj1.sayName();
    </script>
</body>

</html>